The Battle of Heiligerlee (5 August 1536) was a battle during the Guelders Wars, in which the Danish allies of Charles of Guelders, under command of Meindert van Ham, were defeated by Habsburg forces under Georg Schenck van Toutenburg.
In 1534, the Danish Count's Feud spilled over into the Low Countries where the Guelders Wars were raging, when Habsburg supported Enno II, Count of East Frisia, ally of Christopher of Oldenburg and Charles, Duke of Guelders, supported Balthasar Oomkens von Esens, ally of Christian III of Denmark.
In May 1536, Meindert van Ham, supported by Denmark and Guelders, invaded Groningen. He threatened to invade Holland if the Habsburg Netherlands would gather a fleet in support of Christopher of Oldenburg to lift the siege of Copenhagen. Mary of Hungary nevertheless ordered Adolf of Burgundy to compose a fleet of 45 Dutch, Spanish, and Portuguese ships with 3,000 sailors and 4,500 troops under command of Frederick II, Elector Palatine. She also sent Georg Schenck van Toutenburg with the soldiers to Groningen to eliminate the threat of the enemy troops there.
Schenck van Toutenburg was allowed by the citizens to occupy the City of Groningen and continued towards Appingedam. The two armies did battle near Heiligerlee and Meindert van Ham was defeated.
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Text from the Wikipedia article “Battle of Heiligerlee”, available under CC BY-SA 4.0.